summaryrefslogtreecommitdiff
path: root/indra/llaudio/llaudioengine_fmodstudio.cpp
blob: 70b3a0847388a0b7639e1501a62a8bb8980ad16d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
/** 
 * @file audioengine_fmodstudio.cpp
 * @brief Implementation of LLAudioEngine class abstracting the audio 
 * support as a FMODSTUDIO implementation
 *
 * $LicenseInfo:firstyear=2020&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2020, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llstreamingaudio.h"
#include "llstreamingaudio_fmodstudio.h"

#include "llaudioengine_fmodstudio.h"
#include "lllistener_fmodstudio.h"

#include "llerror.h"
#include "llmath.h"
#include "llrand.h"

#include "fmodstudio/fmod.hpp"
#include "fmodstudio/fmod_errors.h"
#include "lldir.h"
#include "llapr.h"

#include "sound_ids.h"

FMOD_RESULT F_CALLBACK windCallback(FMOD_DSP_STATE *dsp_state, float *inbuffer, float *outbuffer, unsigned int length, int inchannels, int *outchannels);

FMOD::ChannelGroup *LLAudioEngine_FMODSTUDIO::mChannelGroups[LLAudioEngine::AUDIO_TYPE_COUNT] = {0};

LLAudioEngine_FMODSTUDIO::LLAudioEngine_FMODSTUDIO(bool enable_profiler)
:   mInited(false),
    mWindGen(NULL),
    mWindDSP(NULL),
    mSystem(NULL),
    mEnableProfiler(enable_profiler),
    mWindDSPDesc(NULL)
{
}


LLAudioEngine_FMODSTUDIO::~LLAudioEngine_FMODSTUDIO()
{
    // mWindDSPDesc, mWindGen and mWindDSP get cleaned up on cleanupWind in LLAudioEngine::shutdown()
    // mSystem gets cleaned up at shutdown()
}


static inline bool Check_FMOD_Error(FMOD_RESULT result, const char *string)
{
    if (result == FMOD_OK)
        return false;
    LL_DEBUGS("FMOD") << string << " Error: " << FMOD_ErrorString(result) << LL_ENDL;
    return true;
}

bool LLAudioEngine_FMODSTUDIO::init(const S32 num_channels, void* userdata, const std::string &app_title)
{
    U32 version;
    FMOD_RESULT result;

    LL_DEBUGS("AppInit") << "LLAudioEngine_FMODSTUDIO::init() initializing FMOD" << LL_ENDL;

    result = FMOD::System_Create(&mSystem);
    if (Check_FMOD_Error(result, "FMOD::System_Create"))
        return false;

    //will call LLAudioEngine_FMODSTUDIO::allocateListener, which needs a valid mSystem pointer.
    LLAudioEngine::init(num_channels, userdata, app_title);

    result = mSystem->getVersion(&version);
    Check_FMOD_Error(result, "FMOD::System::getVersion");

    if (version < FMOD_VERSION)
    {
        LL_WARNS("AppInit") << "FMOD Studio version mismatch, actual: " << version
            << " expected:" << FMOD_VERSION << LL_ENDL;
    }

    // In this case, all sounds, PLUS wind and stream will be software.
    result = mSystem->setSoftwareChannels(num_channels + 2);
    Check_FMOD_Error(result, "FMOD::System::setSoftwareChannels");

    FMOD_ADVANCEDSETTINGS settings;
    memset(&settings, 0, sizeof(settings));
    settings.cbSize = sizeof(FMOD_ADVANCEDSETTINGS);
    settings.resamplerMethod = FMOD_DSP_RESAMPLER_LINEAR;

    result = mSystem->setAdvancedSettings(&settings);
    Check_FMOD_Error(result, "FMOD::System::setAdvancedSettings");

    // FMOD_INIT_THREAD_UNSAFE Disables thread safety for API calls.
    // Only use this if FMOD is being called from a single thread, and if Studio API is not being used.
    U32 fmod_flags = FMOD_INIT_NORMAL | FMOD_INIT_3D_RIGHTHANDED | FMOD_INIT_THREAD_UNSAFE;
    if (mEnableProfiler)
    {
        fmod_flags |= FMOD_INIT_PROFILE_ENABLE;
    }

#if LL_LINUX
    bool audio_ok = false;

    if (!audio_ok)
    {
        const char* env_string = getenv("LL_BAD_FMOD_PULSEAUDIO");
        if (NULL == env_string)
        {
            LL_DEBUGS("AppInit") << "Trying PulseAudio audio output..." << LL_ENDL;
            if (mSystem->setOutput(FMOD_OUTPUTTYPE_PULSEAUDIO) == FMOD_OK &&
                (result = mSystem->init(num_channels + 2, fmod_flags, const_cast<char*>(app_title.c_str()))) == FMOD_OK)
            {
                LL_DEBUGS("AppInit") << "PulseAudio output initialized OKAY" << LL_ENDL;
                audio_ok = true;
            }
            else
            {
                Check_FMOD_Error(result, "PulseAudio audio output FAILED to initialize");
            }
        }
        else
        {
            LL_DEBUGS("AppInit") << "PulseAudio audio output SKIPPED" << LL_ENDL;
        }
    }
    if (!audio_ok)
    {
        const char* env_string = getenv("LL_BAD_FMOD_ALSA");
        if (NULL == env_string)
        {
            LL_DEBUGS("AppInit") << "Trying ALSA audio output..." << LL_ENDL;
            if (mSystem->setOutput(FMOD_OUTPUTTYPE_ALSA) == FMOD_OK &&
                (result = mSystem->init(num_channels + 2, fmod_flags, 0)) == FMOD_OK)
            {
                LL_DEBUGS("AppInit") << "ALSA audio output initialized OKAY" << LL_ENDL;
                audio_ok = true;
            }
            else
            {
                Check_FMOD_Error(result, "ALSA audio output FAILED to initialize");
            }
        }
        else
        {
            LL_DEBUGS("AppInit") << "ALSA audio output SKIPPED" << LL_ENDL;
        }
    }
    if (!audio_ok)
    {
        LL_WARNS("AppInit") << "Overall audio init failure." << LL_ENDL;
        return false;
    }

    // We're interested in logging which output method we
    // ended up with, for QA purposes.
    FMOD_OUTPUTTYPE output_type;
    mSystem->getOutput(&output_type);
    switch (output_type)
    {
    case FMOD_OUTPUTTYPE_NOSOUND:
        LL_INFOS("AppInit") << "Audio output: NoSound" << LL_ENDL; break;
    case FMOD_OUTPUTTYPE_PULSEAUDIO:
        LL_INFOS("AppInit") << "Audio output: PulseAudio" << LL_ENDL; break;
    case FMOD_OUTPUTTYPE_ALSA:
        LL_INFOS("AppInit") << "Audio output: ALSA" << LL_ENDL; break;
    default:
        LL_INFOS("AppInit") << "Audio output: Unknown!" << LL_ENDL; break;
    };
#else // LL_LINUX

    // initialize the FMOD engine
    // number of channel in this case looks to be identiacal to number of max simultaneously
    // playing objects and we can set practically any number
    result = mSystem->init(num_channels + 2, fmod_flags, 0);
    if (Check_FMOD_Error(result, "Error initializing FMOD Studio with default settins, retrying with other format"))
    {
        result = mSystem->setSoftwareFormat(44100, FMOD_SPEAKERMODE_STEREO, 0/*- ignore*/);
        if (Check_FMOD_Error(result, "Error setting sotware format. Can't init."))
        {
            return false;
        }
        result = mSystem->init(num_channels + 2, fmod_flags, 0);
    }
    if (Check_FMOD_Error(result, "Error initializing FMOD Studio"))
    {
        // If it fails here and (result == FMOD_ERR_OUTPUT_CREATEBUFFER),
        // we can retry with other settings
        return false;
    }
#endif

    // set up our favourite FMOD-native streaming audio implementation if none has already been added
    if (!getStreamingAudioImpl()) // no existing implementation added
        setStreamingAudioImpl(new LLStreamingAudio_FMODSTUDIO(mSystem));

    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init() FMOD Studio initialized correctly" << LL_ENDL;

    int r_numbuffers, r_samplerate, r_channels;
    unsigned int r_bufferlength;
    char r_name[512];
    int latency = 100;
    mSystem->getDSPBufferSize(&r_bufferlength, &r_numbuffers);
    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): r_bufferlength=" << r_bufferlength << " bytes" << LL_ENDL;
    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): r_numbuffers=" << r_numbuffers << LL_ENDL;

    mSystem->getDriverInfo(0, r_name, 511, NULL, &r_samplerate, NULL, &r_channels);
    r_name[511] = '\0';
    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): r_name=\"" << r_name << "\"" << LL_ENDL;

    if (r_samplerate != 0)
        latency = (int)(1000.0f * r_bufferlength * r_numbuffers / r_samplerate);
    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): latency=" << latency << "ms" << LL_ENDL;

    mInited = true;

    LL_INFOS("AppInit") << "LLAudioEngine_FMODSTUDIO::init(): initialization complete." << LL_ENDL;

    return true;
}


std::string LLAudioEngine_FMODSTUDIO::getDriverName(bool verbose)
{
    llassert_always(mSystem);
    if (verbose)
    {
        U32 version;
        if (!Check_FMOD_Error(mSystem->getVersion(&version), "FMOD::System::getVersion"))
        {
            return llformat("FMOD Studio %1x.%02x.%02x", version >> 16, version >> 8 & 0x000000FF, version & 0x000000FF);
        }
    }
    return "FMOD STUDIO";
}


void LLAudioEngine_FMODSTUDIO::allocateListener(void)
{
    mListenerp = (LLListener *) new LLListener_FMODSTUDIO(mSystem);
    if (!mListenerp)
    {
        LL_WARNS("FMOD") << "Listener creation failed" << LL_ENDL;
    }
}


void LLAudioEngine_FMODSTUDIO::shutdown()
{
    stopInternetStream();

    LL_INFOS("FMOD") << "About to LLAudioEngine::shutdown()" << LL_ENDL;
    LLAudioEngine::shutdown();

    LL_INFOS("FMOD") << "LLAudioEngine_FMODSTUDIO::shutdown() closing FMOD Studio" << LL_ENDL;
    if (mSystem)
    {
        mSystem->close();
        mSystem->release();
    }
    LL_INFOS("FMOD") << "LLAudioEngine_FMODSTUDIO::shutdown() done closing FMOD Studio" << LL_ENDL;

    delete mListenerp;
    mListenerp = NULL;
}


LLAudioBuffer * LLAudioEngine_FMODSTUDIO::createBuffer()
{
    return new LLAudioBufferFMODSTUDIO(mSystem);
}


LLAudioChannel * LLAudioEngine_FMODSTUDIO::createChannel()
{
    return new LLAudioChannelFMODSTUDIO(mSystem);
}

bool LLAudioEngine_FMODSTUDIO::initWind()
{
    mNextWindUpdate = 0.0;

    if (!mWindDSPDesc)
    {
        mWindDSPDesc = new FMOD_DSP_DESCRIPTION();
    }

    if (!mWindDSP)
    {
        memset(mWindDSPDesc, 0, sizeof(*mWindDSPDesc));	//Set everything to zero
        strncpy(mWindDSPDesc->name, "Wind Unit", sizeof(mWindDSPDesc->name));
        mWindDSPDesc->pluginsdkversion = FMOD_PLUGIN_SDK_VERSION;
        mWindDSPDesc->read = &windCallback; // Assign callback - may be called from arbitrary threads
        if (Check_FMOD_Error(mSystem->createDSP(mWindDSPDesc, &mWindDSP), "FMOD::createDSP"))
            return false;

        if (mWindGen)
            delete mWindGen;

        int frequency = 44100;

        FMOD_SPEAKERMODE mode;
        if (Check_FMOD_Error(mSystem->getSoftwareFormat(&frequency, &mode, nullptr), "FMOD::System::getSoftwareFormat"))
        {
            cleanupWind();
            return false;
        }

        mWindGen = new LLWindGen<MIXBUFFERFORMAT>((U32)frequency);

        if (Check_FMOD_Error(mWindDSP->setUserData((void*)mWindGen), "FMOD::DSP::setUserData"))
        {
            cleanupWind();
            return false;
        }
        if (Check_FMOD_Error(mWindDSP->setChannelFormat(FMOD_CHANNELMASK_STEREO, 2, mode), "FMOD::DSP::setChannelFormat"))
        {
            cleanupWind();
            return false;
        }
    }

    // *TODO:  Should this guard against multiple plays?
    if (Check_FMOD_Error(mSystem->playDSP(mWindDSP, nullptr, false, nullptr), "FMOD::System::playDSP"))
    {
        cleanupWind();
        return false;
    }
    return true;
}


void LLAudioEngine_FMODSTUDIO::cleanupWind()
{
    if (mWindDSP)
    {
        FMOD::ChannelGroup* master_group = NULL;
        if (!Check_FMOD_Error(mSystem->getMasterChannelGroup(&master_group), "FMOD::System::getMasterChannelGroup")
            && master_group)
        {
            master_group->removeDSP(mWindDSP);
        }
        mWindDSP->release();
        mWindDSP = NULL;
    }

    delete mWindDSPDesc;
    mWindDSPDesc = NULL;

    delete mWindGen;
    mWindGen = NULL;
}


//-----------------------------------------------------------------------
void LLAudioEngine_FMODSTUDIO::updateWind(LLVector3 wind_vec, F32 camera_height_above_water)
{
    LLVector3 wind_pos;
    F64 pitch;
    F64 center_freq;

    if (!mEnableWind)
    {
        return;
    }

    if (mWindUpdateTimer.checkExpirationAndReset(LL_WIND_UPDATE_INTERVAL))
    {

        // wind comes in as Linden coordinate (+X = forward, +Y = left, +Z = up)
        // need to convert this to the conventional orientation DS3D and OpenAL use
        // where +X = right, +Y = up, +Z = backwards

        wind_vec.setVec(-wind_vec.mV[1], wind_vec.mV[2], -wind_vec.mV[0]);

        // cerr << "Wind update" << endl;

        pitch = 1.0 + mapWindVecToPitch(wind_vec);
        center_freq = 80.0 * pow(pitch, 2.5*(mapWindVecToGain(wind_vec) + 1.0));

        mWindGen->mTargetFreq = (F32)center_freq;
        mWindGen->mTargetGain = (F32)mapWindVecToGain(wind_vec) * mMaxWindGain;
        mWindGen->mTargetPanGainR = (F32)mapWindVecToPan(wind_vec);
    }
}

//-----------------------------------------------------------------------
void LLAudioEngine_FMODSTUDIO::setInternalGain(F32 gain)
{
    if (!mInited)
    {
        return;
    }

    gain = llclamp(gain, 0.0f, 1.0f);

    FMOD::ChannelGroup* master_group = NULL;
    if (!Check_FMOD_Error(mSystem->getMasterChannelGroup(&master_group), "FMOD::System::getMasterChannelGroup")
        && master_group)
    {
        master_group->setVolume(gain);
    }

    LLStreamingAudioInterface *saimpl = getStreamingAudioImpl();
    if (saimpl)
    {
        // fmod likes its streaming audio channel gain re-asserted after
        // master volume change.
        saimpl->setGain(saimpl->getGain());
    }
}

//
// LLAudioChannelFMODSTUDIO implementation
//

LLAudioChannelFMODSTUDIO::LLAudioChannelFMODSTUDIO(FMOD::System *system) : LLAudioChannel(), mSystemp(system), mChannelp(NULL), mLastSamplePos(0)
{
}


LLAudioChannelFMODSTUDIO::~LLAudioChannelFMODSTUDIO()
{
    cleanup();
}

bool LLAudioChannelFMODSTUDIO::updateBuffer()
{
    if (!mCurrentSourcep)
    {
        // This channel isn't associated with any source, nothing
        // to be updated
        return false;
    }

    if (LLAudioChannel::updateBuffer())
    {
        // Base class update returned true, which means that we need to actually
        // set up the channel for a different buffer.

        LLAudioBufferFMODSTUDIO *bufferp = (LLAudioBufferFMODSTUDIO *)mCurrentSourcep->getCurrentBuffer();

        // Grab the FMOD sample associated with the buffer
        FMOD::Sound *soundp = bufferp->getSound();
        if (!soundp)
        {
            // This is bad, there should ALWAYS be a sound associated with a legit
            // buffer.
            LL_ERRS() << "No FMOD sound!" << LL_ENDL;
            return false;
        }


        // Actually play the sound.  Start it off paused so we can do all the necessary
        // setup.
        if (!mChannelp)
        {
            FMOD_RESULT result = getSystem()->playSound(soundp, NULL /*free channel?*/, true, &mChannelp);
            Check_FMOD_Error(result, "FMOD::System::playSound");
        }

        // Setting up channel mChannelID
    }

    // If we have a source for the channel, we need to update its gain.
    if (mCurrentSourcep)
    {
        // SJB: warnings can spam and hurt framerate, disabling
        //FMOD_RESULT result;

        mChannelp->setVolume(getSecondaryGain() * mCurrentSourcep->getGain());
        //Check_FMOD_Error(result, "FMOD::Channel::setVolume");

        mChannelp->setMode(mCurrentSourcep->isLoop() ? FMOD_LOOP_NORMAL : FMOD_LOOP_OFF);
        /*if(Check_FMOD_Error(result, "FMOD::Channel::setMode"))
        {
        S32 index;
        mChannelp->getIndex(&index);
        LL_WARNS() << "Channel " << index << "Source ID: " << mCurrentSourcep->getID()
        << " at " << mCurrentSourcep->getPositionGlobal() << LL_ENDL;
        }*/
    }

    return true;
}


void LLAudioChannelFMODSTUDIO::update3DPosition()
{
    if (!mChannelp)
    {
        // We're not actually a live channel (i.e., we're not playing back anything)
        return;
    }

    LLAudioBufferFMODSTUDIO  *bufferp = (LLAudioBufferFMODSTUDIO  *)mCurrentBufferp;
    if (!bufferp)
    {
        // We don't have a buffer associated with us (should really have been picked up
        // by the above if.
        return;
    }

    if (mCurrentSourcep->isAmbient())
    {
        // Ambient sound, don't need to do any positional updates.
        set3DMode(false);
    }
    else
    {
        // Localized sound.  Update the position and velocity of the sound.
        set3DMode(true);

        LLVector3 float_pos;
        float_pos.setVec(mCurrentSourcep->getPositionGlobal());
        FMOD_RESULT result = mChannelp->set3DAttributes((FMOD_VECTOR*)float_pos.mV, (FMOD_VECTOR*)mCurrentSourcep->getVelocity().mV);
        Check_FMOD_Error(result, "FMOD::Channel::set3DAttributes");
    }
}


void LLAudioChannelFMODSTUDIO::updateLoop()
{
    if (!mChannelp)
    {
        // May want to clear up the loop/sample counters.
        return;
    }

    //
    // Hack:  We keep track of whether we looped or not by seeing when the
    // sample position looks like it's going backwards.  Not reliable; may
    // yield false negatives.
    //
    U32 cur_pos;
    mChannelp->getPosition(&cur_pos, FMOD_TIMEUNIT_PCMBYTES);

    if (cur_pos < (U32)mLastSamplePos)
    {
        mLoopedThisFrame = true;
    }
    mLastSamplePos = cur_pos;
}


void LLAudioChannelFMODSTUDIO::cleanup()
{
    if (!mChannelp)
    {
        // Aborting cleanup with no channel handle.
        return;
    }

    //Cleaning up channel mChannelID
    Check_FMOD_Error(mChannelp->stop(), "FMOD::Channel::stop");

    mCurrentBufferp = NULL;
    mChannelp = NULL;
}


void LLAudioChannelFMODSTUDIO::play()
{
    if (!mChannelp)
    {
        LL_WARNS() << "Playing without a channel handle, aborting" << LL_ENDL;
        return;
    }

    Check_FMOD_Error(mChannelp->setPaused(false), "FMOD::Channel::pause");

    getSource()->setPlayedOnce(true);

    if (LLAudioEngine_FMODSTUDIO::mChannelGroups[getSource()->getType()])
        mChannelp->setChannelGroup(LLAudioEngine_FMODSTUDIO::mChannelGroups[getSource()->getType()]);
}


void LLAudioChannelFMODSTUDIO::playSynced(LLAudioChannel *channelp)
{
    LLAudioChannelFMODSTUDIO *fmod_channelp = (LLAudioChannelFMODSTUDIO*)channelp;
    if (!(fmod_channelp->mChannelp && mChannelp))
    {
        // Don't have channels allocated to both the master and the slave
        return;
    }

    U32 cur_pos;
    if (Check_FMOD_Error(mChannelp->getPosition(&cur_pos, FMOD_TIMEUNIT_PCMBYTES), "Unable to retrieve current position"))
        return;

    cur_pos %= mCurrentBufferp->getLength();

    // Try to match the position of our sync master
    Check_FMOD_Error(mChannelp->setPosition(cur_pos, FMOD_TIMEUNIT_PCMBYTES), "Unable to set current position");

    // Start us playing
    play();
}


bool LLAudioChannelFMODSTUDIO::isPlaying()
{
    if (!mChannelp)
    {
        return false;
    }

    bool paused, playing;
    mChannelp->getPaused(&paused);
    mChannelp->isPlaying(&playing);
    return !paused && playing;
}


//
// LLAudioChannelFMODSTUDIO implementation
//


LLAudioBufferFMODSTUDIO::LLAudioBufferFMODSTUDIO(FMOD::System *system) : mSystemp(system), mSoundp(NULL)
{
}


LLAudioBufferFMODSTUDIO::~LLAudioBufferFMODSTUDIO()
{
    if (mSoundp)
    {
        mSoundp->release();
        mSoundp = NULL;
    }
}


bool LLAudioBufferFMODSTUDIO::loadWAV(const std::string& filename)
{
    // Try to open a wav file from disk.  This will eventually go away, as we don't
    // really want to block doing this.
    if (filename.empty())
    {
        // invalid filename, abort.
        return false;
    }

    if (!LLAPRFile::isExist(filename, NULL, LL_APR_RPB))
    {
        // File not found, abort.
        return false;
    }

    if (mSoundp)
    {
        // If there's already something loaded in this buffer, clean it up.
        mSoundp->release();
        mSoundp = NULL;
    }

    FMOD_MODE base_mode = FMOD_LOOP_NORMAL;
    FMOD_CREATESOUNDEXINFO exinfo;
    memset(&exinfo, 0, sizeof(exinfo));
    exinfo.cbsize = sizeof(exinfo);
    exinfo.suggestedsoundtype = FMOD_SOUND_TYPE_WAV;	//Hint to speed up loading.
    // Load up the wav file into an fmod sample (since 1.05 fmod studio expects everything in UTF-8)
    FMOD_RESULT result = getSystem()->createSound(filename.c_str(), base_mode, &exinfo, &mSoundp);

    if (result != FMOD_OK)
    {
        // We failed to load the file for some reason.
        LL_WARNS() << "Could not load data '" << filename << "': " << FMOD_ErrorString(result) << LL_ENDL;

        //
        // If we EVER want to load wav files provided by end users, we need
        // to rethink this!
        //
        // file is probably corrupt - remove it.
        LLFile::remove(filename);
        return false;
    }

    // Everything went well, return true
    return true;
}


U32 LLAudioBufferFMODSTUDIO::getLength()
{
    if (!mSoundp)
    {
        return 0;
    }

    U32 length;
    mSoundp->getLength(&length, FMOD_TIMEUNIT_PCMBYTES);
    return length;
}


void LLAudioChannelFMODSTUDIO::set3DMode(bool use3d)
{
    FMOD_MODE current_mode;
    if (mChannelp->getMode(&current_mode) != FMOD_OK)
        return;
    FMOD_MODE new_mode = current_mode;
    new_mode &= ~(use3d ? FMOD_2D : FMOD_3D);
    new_mode |= use3d ? FMOD_3D : FMOD_2D;

    if (current_mode != new_mode)
    {
        mChannelp->setMode(new_mode);
    }
}

// *NOTE:  This is almost certainly being called on the mixer thread,
// not the main thread.  May have implications for callees or audio
// engine shutdown.

FMOD_RESULT F_CALLBACK windCallback(FMOD_DSP_STATE *dsp_state, float *inbuffer, float *outbuffer, unsigned int length, int inchannels, int *outchannels)
{
    // inbuffer = fmod's original mixbuffer.
    // outbuffer = the buffer passed from the previous DSP unit.
    // length = length in samples at this mix time.

    LLWindGen<LLAudioEngine_FMODSTUDIO::MIXBUFFERFORMAT> *windgen = NULL;
    FMOD::DSP *thisdsp = (FMOD::DSP *)dsp_state->instance;

    thisdsp->getUserData((void **)&windgen);

    if (windgen)
    {
        windgen->windGenerate((LLAudioEngine_FMODSTUDIO::MIXBUFFERFORMAT *)outbuffer, length);
    }

    return FMOD_OK;
}